中氣層頂

中 = 丨 + 口 : Mnemonic symbol: a dart board, because you always try to hit the center.

Julian Giant Squid (zhu-) is throwing dinosaur bones (丨) as darts on a dart board in front of the engine ((e)ng1). To make it a bit more difficult he's throwing mandarins (口) into the air as well and skewers them up right in the center (中 is a mandarin skewered on a dinosaur bone) in mid flight with the dinosaur bones. He's still able to consistently hit the center (中) of the dart board.

Mnemonic symbol: a balloon. The Queen of Hearts is disappointed by her balloons. She expected them to float upwards, but in the space station's bathroom, They float randomly in all directions.

层 = 云 + 尸 : The King of Chu (c) is enjoying a lasagna (千层面) in the engine's kitchen ((e)ng2) when suddenly a ghost (尸) surrounded by a dark cloud (云) appears and starts to haunt him. Terrified, the King of Chu drops the lasagna and runs away. The ghost reached its goal and starts devouring the lasagna himself.

顶 = 丁 + 页 : Dorothy Gale (di) is taking care of the receipts (页) inside of the engine ((e)ng3). She has a big nail (丁) on her head (顶) and every time there is a new receipt, she just pierces it onto the nail.